And james h



G. W. BATCHELL & J. H. WADE. Mums FuRNAcE.

. APPLICATION FILEDMAR. I8. 1916. 1,1 95,641 Patented Aug. 22,1916.

Y 2 SHEETS-SHEET l. l gl 9 j ATTORN EY G. W. BATCHELL & J. H. WADE.

MUFFLE FURNACE.

APPLICATION FILED MAR. |B| 1916. 1 ,1 95,641 Patented Aug. 22, 1916.

2 SHEETS-SHEET 2- UNiTED strav l PATENT on oE- GEORGE W. BATCHELL, OF CINCINNATI, OHIO, AND JAMES II. WADE, OF MOUNDSVILLE,

. WEST VIRGINIA.

MUFFLE-FURNACE.

Specification of Letters Patent.

Patented Aug. 22, 1916 Application led March 18, 1916. Serial N o. 85,150.

To all whom t may concern:

Be it known that we, GEORGE W. BATCHELL and JAMES H. WADE, citizens of the United States, residing, respectively, at Cincinnati, county of Hamilton, lState of Ohio, and Moundsville, in the county of Marshall and State of West Virginia, have invented a new and useful Munic-Furnace, of which the following is a specification.

This invention has reference to muie furnaces of the down draft type, and particularly adapted for annealing purposes.

The object of the invention is to equalize and conserve the heat and distribute it about the articles or ware being annealed.

The invention comprises a furnace with a' muiiie chamber or oven surrounded by flues leading from a lire chamber about the oven from alternately opposite sides and discharging into a common iiue ultimately leading to the stack. Each iue of the series extending about the oven from opposite sides is provided with an individual damper, and exterior to the alternately arranged flues provision is made for heat insulation, whereby loss of heat by radiation is to a great extent prevented. Y

The invention will be best understood from a consideration of the following detailed description, taken in connection with the accompanying drawings forming part of this specification, with the further understanding that '.wliil'e the drawings show a practical form of the invention, the latter is not confined to any strict conformitywith the showing of the drawings, but may be' changed and modifiedl so long as. such changes and modifications come within the scope of the appended claims. In the drawings: Figure 1 is a longitudinal vertical section of the improved furnace. Fig. 2 is a section on the line 2-2 of Fig. 1 but omitting one side of the furnace. Fig. 3 is a cross-section of the furnace through one of the series of alternating heating lues. Fig. 4f4 is a section on the line L1--4 of Fig. 3. Referring to the drawings, there is shown a basic structureA 1 which may be made of some refractory material, such, for instance, as fire brick. This basic structure has side thesidel walls 3 are channel beams 4 on opposite sides of the furnace carried.- byV buckstaves 5 Iwith the 1atter joined at the furnace.

vtially equal throughout.

upper ends by connecting rods 6, and also carrying other channel beams 7 at suitable heights. Rising from the beams 4 and continued over the arch 3 is an envelop 8 of heat insulating material covered exteriorly by other walls 9 having a crown portion 10 over that portion of the heat insulating material'` covering the arch 3.

Within the base 1 and extending lengthwise .thereof is a flue 11 constituting the outlet Hue and which may be continuedto and discharge into a suitable stack, the latter, however, not being shown. Above the flue 11 is another longitudinallyextended flue 12 underlying a muflie chamber 13, which latter is located between the side walls 2 and beneath the arch 3. The muie chamber is provided with an entrance opening 14, which, of course, when the furnace is in operation is closed by suitable means not shown in the drawing.

The -flue 1'2 is entered at one end by a burner 15 which may bc assumed to be supplied with suitable fuel through` a pipe 16 containing a controlling valve 17. The burner 15 with its supply pipe is represent-` ative of any suitable type of burner capable of supplying fuel enough to produce a sufficiently hot `iame for the purposes of the Leading from opposite sides of the fiue 12 are otherflues 18 contained within the niuiie chamber 13. Each iue 18 communicates with a flue 12 through a port or opening 19, and is thence continued up one side of the muflle chamber, beneath the arch 3,v and down the other side of the muflie chamber,1having a continuation 20 into the base 1, and ultimately opening into the flue 11 byl way of a port or passage 21. Within the continuation20 there is lodged a damper' plate 22 of some suitable refractory material so arranged as toi be movable into traversing relation tothe continuation 2O to varying degrees, whereby the passageof hot products of combustion through the flue may be con; trolled at will. By having the iiues 18 with vtheir uptakes and downtakes on alternately opposite sides of the muflie chamber, there is produced a substantially equal distribution of heat in the muflie chamber,so that the temperature of the chamber vis substan- The iues 18 are lodged within the muiiie chamber andare separated inwardly from the side walls 2' by yspacers 23, whereby all parts of the flues 4Within the chambers are utilized heat radiation.;-

The` hot: products of combustion from the burners: or firevv chamber end of the flue 12 pass beneath .the muflle chamber, thence to andV up; theA flues. 18 on alternately opposite sidesofrthe ichamber, over thev ktop Vor arch portion cfr-the.A chamber,I `and thence down.-

wardlyon alternately opposite sides. of the' chamber, finally discharging downwardly' into the1`outlet. iuell. arrangedLin the.bottornpartv of the .furnace structure, whichV furnace is',\therefore,I of the Adovvn draft` type. The layer8 of heat insulating Amate rial in envelopingy relation to the sidesand top of ythe muiie chamber serves to retard radiation of heat from. the muiiie chamber, Wherefore there is but` a negligible v vaste of heat by radiation. For these reasonsthe muiiev furnace of the present invention` is economical in operation, and is highly .Gmcient for annealing-purposes, ljsince. the temperaturethroughout the muiie structure .is

.- sensiblyeven-V and the articles subjectedto the.. annealing temperature are uniformly i annealed.

tov

What. is claimed iszf-fp 1. A muie furnace having a muflieyfcham'- bell*` with va. series; of spaced` iues contained :Within the chamber and. extending in alter nation` up on'e side of said chamber,` across the top thereof and down the other Side of the'chamber, a flue underlying the .riuie chamber and communicating Withv'all the lues. on the oppoite sides of. fthev chamber, said last-named flue `yhavingmeans fory the combustinof fuel toproduce heat, and an outletA fflue. v underneath the f flue. uIldQllying the mufliegchamber; andcommunicatingfwith allthe, uesilextending through the chamber. muiie Vfurnacehavingga muiiie cham'- ber .with -a rseriesgof spaced4 flucs contained y,Within the chamber and.l extending in -altergnation` up ,one side of saidchamber, lacross the top thereof and down the other side-of the chamber, a iueunderlyingthe muflie chamber i' andy communicating with all the fines .en 'the4 opposite sidesy :of the chamber., said last-named flue` having means for the combustion oflfuel toproduce heat, and` an,

v outlet flue underneath the iiueyunderlying v the muie chamber and;communicating-with all the fines extending through thechambe'r,

said' .filles exiieudillefthrough .the .muie .chamberheingeach provided Withpa valve or damper individual thereto for controlling the, flow o fheated products of combustion therethrough. ,i 3.l iAf uiie furnace rovifled with amuffle chamber, `spacedV eating lines wholly within the chamber .Where .traversing it and extenda upaand down. -oppQSite Sides....of

.said vmu e chamber and-overthetop thereof,

a heating flue with means therein for. the combustion of fuel and communicating with the uptake.V sidesl of the ii-rst-.named flues, an outlet flue underlying the-heating flue and. communicatingjwith the .dou-intake sides of the first-namediues, anda yalve ori damper in thedowntake. side; of each-of the irstfnamediiues .and individual thereto.

.4. A muiiie Ifurna-ceyprovicled.with a mllf.- fle chamber with heating; flues..contained Within and rtraversing saidV chamber, and heat. insulating materlal; lodged Within ,the Wallspf; the vmuile ychambergin enveloping relation tothe sides and tcppf thechamber. i 5. Ajmuiie furnace having la muiiechamchamber,..a' series ofiiues.` insideof the chambery and 'spacedjapart lengthwiseof .the series; with .alternate fines. communicating with the` respectively` oppositesides of thev heating flue underneath the chambenleach vof theseri'es ofiiues rising withinthe chamber along one side of said chamber, extending across the I'top and downthe other side the innerwall of thetop ofthe chamber` and ber, a heating Hue extending. beneath 'the v down and lspaced fromthe inner: `Wally of the. other side thereof, 'andi :an ioutletgi'lue into which: all ofi-,the heating luesl-;Within the 1chamber` discharge, said l outlet fine being located beneaththe firstnamedflue.,l f l 7. A `mufllefurnace havingl a muiiielchamber, a,.lheating flue extending; beneath ythe chamber, a.' series o f flues inside of 'the chanelber with alternatefiues'v communi eatingy with the-respectively opposite sides ofthe heat*- ing .fluev underneath the-chamber, leach`Y of thesperies of flues rising within the chamber along one f side. Lof; said fchajmber',. extending acrossthe topuofthe c hamberyand down the :other side thereof, and-e an,` outlet.' Hue into which.. lljfofthe e heating iues Within.l the chamber-1v dischargav saidl ,outlet-L flueg' being located-beneath the yirsti-named-ffl-ue, and. the downtakefsifde of each of. the seriesofaues extending .through thezbottolnfofl thejchamberj .andl tlfiere,A provided lwitlng a'. vregulating valve orf .damperindividual thereto`. g1

8.rv A muiie furnace rovidedwithajmuiiie chamber, a4 prima eatingaiue'- 'underly- .in the muiiie 'cham er,'; a series of fines comv tained `Within the chamber. andfeach having ich upright side' portionsvl at. res ectively oppo- ,site sides of the chamberipnjspaced- .relation to the inner side walls thereof, and a connecting top portion within and extend-` ing across the top of the chamber in spaced i chamber, -a primary heating Hue underlying the muille chamber, a series of Hues each having upright. side portions at. respectively opposlte sides of the chamber in spaced relation to the side Walls thereof, and a connecting top portion extending across the top of the chamber in spaced relation to the top wall thereof, said Hues being connected in alternation to the primary heating Hue on respectively oppositefsdes thereof, and an outlet Hue below the primary heating Hue with the series of 'Hues connected in alternation to respectively opposite sides thereof, said furnace having heat insulating ma terial embedded in its Walls along the sides and over the top of the muiile chamber.

10. A muie furnace having' a muflie chamber with a seriesof heat conducting Hues contained within said chamber,'and a primary heating Hue underlying the cham-- ber, the Hues within the chamber being spaced apart in the direction of the length of the series and connected in alternation from thebttom of the muiiie chamber to respectively opposite sides of the primary heating flue underneath the Inutile chamber. i 11. A muffie furnace provided with a muflle chamber, means for directing heat primarily beneath the chamber, and means contained within the chamber in spaced relation to the inner Walls thereof for directing heat from beneath the chamber up each side thereof, acrossthe top, and down the opposite side of the chamber from the rising movements of the heat.

' 12. A muiile furnace having a muifle chamber with heating Hues interior to and in spaced relation to the inner side and top walls of the chamber, each Hue alternatingl with the adjacent fines with respect to the direction of movement of the heating medium therethrough.

v13. A mutlle furnace having a muie chamber with heating Hues therein in spaced relation to the side and top walls of the chamber, each Hue alternating with the adjacent Hues with respect to the direction of movement of the heatin medium therethrough, said furnace having a heating Hue communicating with the intake sides of the Hues within the muiile chamber and extending beneath the Hoor of the muile chamber. 14. A Inutile' furnace having a muie chamber `with heating Hues therein in spaced4 65 relation to the side and top walls of the chamber, each Hue alternating with the adjacent Hues with respect to the direction` of movement of the heating medium therethrough, said furnace having a heating Hue communicating with the intake sides of the Hues within the muftle chamber and extending beneath the Hoor of the muflle chamber," and said furnace also being .provided with an escape Hue for the heating element communicating with the outlet sides of the Hues within the inutile chamber, said last-named sides of the Hue Within the muftle chamber extending downwardly to the point of communication with the common outlet Hue.

15. A mutlie furnace provided With an' esca e Hue, a primary heating Hue and a mu e chamber in superposed order, with the sides and top wall of the mutlie chamber having heat insulating material embedded therein in enveloping relation to the sides and top of the mufile chamber, and a series of heating Hues in Athe muHle cham- 1 ber in spacedlrelation to the top and side walls of said. muile chamber, said 'last- 90 named Hues being connected on alternately opposite sides of the `muffle chamber with theprimary heating Hue and on the cor- GEORGE W. BATCHELL.v JAMES H. WADE.

Witness as to Batchell: SEN BEHYMEN.

`VVitnesses as to James H. Wade:

G. W. DRAKE, CHAS. A. SHOWACRE.

Copies of this patent may be obtained for tive cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

